Block eco 2003 efficient pcb mount transformers block eco2003 5 0dd9 the block eco efficient pcb mount transformer 5va 2 x 9v 2 x 277ma acts as a safety transformer for the safe electrical isolation of the input and output sides the transformer is suitable for creating selv and pelv circuits because of the limit on the output voltagedesigned with low no load losses max 06w as well as being unconditionally short circuit proof up to 15 va this transformer also has double output vol